Scandium triflate-catalyzed intramolecular Friedel–Crafts acylation with Meldrum's acids: insight into the mechanism
作者:Eric Fillion、Dan Fishlock
DOI:10.1016/j.tet.2009.05.058
日期:2009.8
Friedel–Crafts acylation of arenes with Meldrum'sacid derivatives catalyzed by Sc(OTf)3 was reported as a mild and general entry into functionalized 1-indanones. Mechanistic investigations were undertaken to determine the rate-determining step in the acylation sequence using Meldrum'sacid, as well as to examine the role of the Lewis acid catalyst. Enolizable Meldrum'sacid derivatives react via an acyl ketene